void PageViewportController::didRenderFrame(const IntSize& contentsSize, const IntRect& coveredRect)
{
if (m_clientContentsSize != contentsSize) {
m_clientContentsSize = contentsSize;
// Only update the viewport's contents dimensions along with its render if the
// size actually changed since animations on the page trigger DidRenderFrame
// messages without causing dimension changes.
m_client->didChangeContentsSize(contentsSize);
}
m_lastFrameCoveredRect = coveredRect;
// Apply any scale or scroll position we locked to be set on the viewport
// only when there is something to display there. The scale goes first to
// avoid offsetting our deferred position by scaling at the viewport center.
// All position and scale changes resulting from a web process event should
// go through here to be applied on the viewport to avoid showing incomplete
// tiles to the user during a few milliseconds.
if (m_effectiveScaleIsLocked) {
m_client->setContentsScale(m_effectiveScale, false);
m_effectiveScaleIsLocked = false;
}
if (m_viewportPosIsLocked) {
FloatPoint clampedPos = clampViewportToContents(m_viewportPos, m_effectiveScale);
// There might be rendered frames not covering our requested position yet, wait for it.
if (FloatRect(clampedPos, viewportSizeInContentsCoordinates()).intersects(coveredRect)) {
m_client->setViewportPosition(clampedPos);
m_viewportPosIsLocked = false;
}
}
}
void PageViewportController::pageDidRequestScroll(const IntPoint& cssPosition)
{
// Ignore the request if suspended. Can only happen due to delay in event delivery.
if (m_activeDeferrerCount)
return;
m_client->setViewportPosition(clampViewportToContents(cssPosition, m_effectiveScale));
}
void PageViewportController::syncVisibleContents(const FloatPoint& trajectoryVector)
{
DrawingAreaProxy* const drawingArea = m_webPageProxy->drawingArea();
if (!drawingArea || m_viewportSize.isEmpty() || m_contentsSize.isEmpty())
return;
FloatRect visibleContentsRect(clampViewportToContents(m_viewportPos, m_effectiveScale), viewportSizeInContentsCoordinates());
visibleContentsRect.intersect(FloatRect(FloatPoint::zero(), m_contentsSize));
drawingArea->setVisibleContentsRect(visibleContentsRect, m_effectiveScale, trajectoryVector);
m_client->didChangeVisibleContents();
}
void PageViewportController::pageDidRequestScroll(const IntPoint& cssPosition)
{
// Ignore the request if suspended. Can only happen due to delay in event delivery.
if (m_hasSuspendedContent)
return;
FloatRect endVisibleContentRect(clampViewportToContents(cssPosition, m_effectiveScale), viewportSizeInContentsCoordinates());
if (m_lastFrameCoveredRect.intersects(endVisibleContentRect))
m_client->setViewportPosition(endVisibleContentRect.location());
else
// Keep the unclamped position in case the contents size is changed later on.
applyPositionAfterRenderingContents(cssPosition);
}
